Polyester Laminated Building Boards Surface Finish
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Solution Overview
Problem
Conventional building boards, such as paper faced, GRG, and EGRG boards, require extensive finishing materials and labor-intensive processes to achieve a smooth exterior finish, with issues like absorption of finishing compounds leading to voids, cracking, and increased time and expense.
Innovation Solution
The use of a polyester laminate, adhered to a fibrous mat via a hot melt adhesive, facilitates the formation of a smooth exterior surface on building boards, allowing for a Level 5 finish without additional materials or extensive labor, by providing a stable base for exterior coatings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If glass fiber mats are embedded into the core slurry to eliminate exposed fibers, then surface smoothness is improved, but the board absorbs finishing compounds too quickly causing voids and cracking
Solution Approach 1:
The patent introduces an intermediary layer consisting of a release paper and a polymer coating on the glass fiber mat. This intermediary layer acts as a barrier between the porous glass fiber mat and the finishing compound, preventing excessive absorption while allowing the smooth surface to be achieved. The release paper controls the rate of absorption, and the polymer coating provides a stable base for finishing applications.
2Ease of manufacture
If paper liners are used on gypsum board, then ease of manufacture is improved, but the surface cannot achieve Level 5 finish without extensive skim coats and sealers
Solution Approach 1:
The patent creates a composite structure combining glass fiber mat, release paper, and polymer coating layers. This composite material provides both the ease of manufacture associated with traditional paper liners and the surface quality needed for Level 5 finishes. The combination of materials allows the board to accept finishing compounds properly without requiring extensive skim coats.
3Quantity of substance
If large volumes of finishing compounds are used to overcome quick absorption on GRG boards, then surface coverage is improved, but material cost and application time increase
Solution Approach 1:
The release paper and polymer coating act as intermediaries that regulate the absorption of finishing compounds. This controlled absorption mechanism allows finishing compounds to be applied in normal volumes without being rapidly absorbed into the glass fiber mat, thereby reducing both material waste and application time while maintaining proper coverage.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The polyester laminate enables the achievement of a smooth exterior finish on building boards with minimal materials, time, and expense, reducing the need for extra finishing steps and materials, while ensuring a durable and even surface.
Implementation Method 1
adhered to a fibrous mat via a hot melt adhesive
Implementation Method 2
hot melt adhesive
Data Source
AI summary
This disclosure relates to using polyester films on building boards to enable improved surface coatings. The polyester film is preferably applied to a glass mat via an adhesive to form a laminate. This laminate is then bonded to the exterior surface of a gypsum board. The polyester film is advantageous because it allows for exterior surface coatings to be applied. In one embodiment, an exterior acrylic coating is applied to the polyester film. Boards constructed in accordance with this disclosure allow for exterior finishings to be achieved without the need for excessive finishing materials or steps.